Means for protecting the retorts of stokers against high temperatures



Nov. 28, 1939 R. c. JOHNSON MEANS FOR PROTECTING THE RETORTS OF STOKERS AGAINST HIGH TEMPERATURES Filed July 31, 193? 44 ATTQRNEY INVENTOR/ J,

Patented Nov. 28, 1939 PATENT o1=1=1c1a MEANS FOR PROTECTING THE RETORTS OF STOKERS AGAINST HIGH TEMPERATURES Ross C. Johnson, Dayton, Ohio Application July 31, 1937, Serial No. 156,805

2 Claims.

This invention relates to new and useful improvements in means for protecting the retorts of stokers against high temperatures.

-It is one of the principal objects of my invention to provide a fire box having means such as a plate for protecting the retorts of stokers, and more particularly those stokers which are used in brick, tile and pottery kilns, annealing furnaces, bake ovens and other structures from 10 exposure to the extremely high temperatures prevailing in such furnaces. In a brick kiln for instance, the fire box temperature, which averages about 5500 degrees Fahrenheit, would soon burn out theretort and tuyeres of .a stoker em- 16 ployed to deliver fuel and air to the kiln. The

plate structure which I apply to the retort, how-' even-will protect it against such high tempera:

tures by permitting atmospheric or other air or And Figure 3 is a sectional view' taken through said fire box at right angles to the section illustrated in Figure 2.

Referring to the accompanying drawing, for a detailed description of my invention, the numeral I designates the hopper, 2 the feed tube and 3 the retort of a conventional mechanical stoker.-

' Within the retort are tuyres 4 which receive a forced draft from an' air tube 5. v

The tubes 2 and 5 project into the ash pit 6 of a fire box 1 to bring the retort- 3 and its tuyres 4 in a proper position therein to discharge fuel and air thereto. 1

In order to protect the retort and tuyres against the extremely high temperatures encountered in brick, tile and pottery kilns for example, I provide a metal plate which, in the present instance, is made in sections. One section 8 of this plate is mounted in the fire box I, at one side of, and a short distance below, the retort 3, upon members such as I-beams 9, 9 on the floor of the ash pit 6. To this stationary section 8 of the plate, there are hingedly connected two sections l0 and which are 'concaved at their inner edges to fit against the curved wall of the retort 3.

The free end of each hinged or swinging plate section has on its bottom surface a projection l2 'pivotally connected by a link [3 to the inner end of 'a longitudinally movable operating rod ll carrying a handle IS on its outer, end. Each rod H which is supported for longitudinal move-- ment by a bracket l6 secured to the fire box wall, is pivotally connected to the free end of its re-' spective link I3 and to another'link l8 that is pivotally'secured at.its lower end to a bracket IS on the concrete floor of the ash pit.

When the operating rods are forced inwardly, they will'raise the plate sections ill and II to the lovel of the stationary section 8, to form around the retort 3-, a short distance below its top, a protective surface upon which refractory material such as silica (not shown) may be placed. Now, the atmospheric airwhich enters the ash pit 6 will be prevented by the plate from leaving thetop of the-fire box 1, whereupon said air will circulate around the bottom of the retort to cool it so thatit will not be fused or melted by high temperatures. Since the plate is below the top of the retort and the outer openings of the tuyres, it will not interfere with the forced draft discharged by the latter.

When it is desired to dump slag or clinkers from the protective plate, the two sections In and H thereof may be lowered by pulling the operating rods l4 outwardly to break the links l3 and I8;

I do not desire to be limited to the details o 1 construction and arrangement herein shown and described, and any changes or modifications may be made therein within the scope of the subjoined claims. 7

Having described my inventlon, I claim:

1. In stoker apparatus of the class described, the combination with a fire-box having an opening in the base thereof to atmosphere, and a retort therein spaced from the walls of said box and having tuyere openings in the upper por-' tion thereof, of a partition member extending across the fire-box between the tuyre openings of the retort and the air opening of the firebox and dividing the fire-box into a combustion chamber and a cooling chamber, said partition comprising a stationary section having a dumping door therein for establishing communication between the combustion chamber and the cooling chamber, and means extending outwardly of the fire-box for operating the door to-open and close the same.

2. In stoker apparatus of the class described, the combination with a fire-box having an opening in the base thereof communicating with the atmosphere, and a retort therein spaced from the walls of said box and having tuyere openings in the upper portion thereof, of a partition 1o chamber and a cooling chamber beneath the same with which said air opening communicates, said partition having a stationary section and downwardly opening movable sections, means for supporting the stationary section and means for supporting and operating the movable sections, said last-named means comprising a toggle device and an operating lever extending through the walls of the fire-box.

ROSS C. JOHNSON. 

